Concentration of solute in extract Concentration of solute in raffinate '

The value of K defines the ease of extraction. When there is a relatively high K value, good stability of product and good separation of the aqueous and solvent phases, then it may be possible to use a single-stage extraction system (Fig. 10.24). A value of 50 indicates that the extraction should be straightforward whereas a value of 0.1 shows that the extraction will be difficult and that a multistage process will be necessary. Unfortunately, in a number of systems the value of K is low and co-current or counter-current multistage systems

Table 10.1. Dielectric

constants of solvents at 25°C (arranged in

order of increasing polarity)


Dielectric constant


1.90 (least polar)


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